Wrench



Sept. '11, 1923.

R. MACKIN WRENCH Filed April 6, 1922 Patented Sept. 11, 19233.

auras stares narra e RICHARD MACK IN, OF BOSTON, MASSACHUSETTS.

WRENCH.

Application filed April 6,

To all whom it may concern: 1

Be it known that I, RICHARD MAG IN, a citizen of the United States of America, and a resident of Boston, in the county of Suffolk and Commonwealth of Massachusetts, and whose post-office addressis 61 Orchard Field St, Dorchester, have invented certain new and useful Improvements in Wrenches, of which the following is a speci fication. V l

This invention relates to wrenches, particularly to the type known as monkey wrench and while shown in connection therewith it is obvious that it may be used with equally good results in certain. types of pipe wrenches or certain forms of pipe.

cutting tools.

: ,the object upon which it is An object of the invention is to produce a wrench that may be rapidlyadjusted to a nut, bolt or otherobject. to be operated upon, with a minimum of manipulation and time in so doing.

A further object of the invention is to so construct the wrenchthat but one handgis required to make a rapid initial. adjust ment, and the finer final adjustment of it to intended to operate. f

A still further object of theinvention is to j simplify and make more compact certain portions of the wrench pertaining ,to the means for disengaging the adjusting nut from the threaded or toothed angular memher or movable The present invention is an improvement on patent granted to me February 25, 1919, No. 1,295,546, wherein the adjusting nut is held in engagement with the toothed angular member by a spring referred to as an arched shape tail, pressure upon which caused the adjustment nut to move out of engagement with said member.

lVhen said disengagement took place and. the wrench was to be adjusted foruse, the angular member was pushed toward the stationary jaw and thereafter the pressure on said tail was released and the adjusting nut again engaged the toothed member.

This operation required the use of two hands and considerably more time than is required in the present invention, and fur thermore the arched tail was at times in the way and susceptible to breakage and detracted from the appearance of the wrench in general.

To the attainment of the above objects the 1922. Serial No. 550.204.

invention consists in. certain novel features of construction, arrangement and combination of parts which will be fully understood from a description of the drawings and the claim hereinafter given.

Of-the drawings:

Figure 1 represents in elevation, partially broken away, one form of wrench to which the invention is applicable.

Figure 2 a view similar to Figure 1 certain of the parts being in section but showing the adjusting nut disengaged from the toothed portion of the movable jaw and the position said jaw would assume relative to a' nut or bolt when said disengagement took place. j

Figure 3 a section on the line 33 Figure 1.

Figure 4 a section on the line 44 Figure 1.

Figure 5 a plan view of the nut carrying plate detache 1 Like characters designate like parts throughout the several figures of the drawings.

Referring to the drawings:

The wrench shown herewith is of the monkey wrench t-ypeand consists of a handle 10 of such arrangement as to receive the shank 11 of a stationary jaw 12, said shank having a shoulder 13 abutting the top of handle 10 and a threaded portion 14 to receive the nut 15. and if desired saidhandle and shank maybe held together by means of rivets 16. l j 1 A movable aw 17 adapted to slide on said shank relatively to said jaw 12 has an extension 18 adapted to be received and housed in said handle 10, a spring 19 also in said handle tends to press said extension and at tached movable jaw 17 toward the jaw 12.

The said extension 18 is provided with a thread-like teeth 20 on one face thereof adapted to be normally engaged by an adjusting nut 21. rotary movement ot which in one direction or the other causes said jaw 17 to travel toward or away from the jaw 12.

The nut 21 is pivotally mounted on a plate 25 which is arranged to slide transversely of the shank 11 but is normally held in the position Figure 1 by means of the spring 26, said plate having an upstanding portion 27 against which said spring abuts, and which conveniently acts as a thumb or finger piece upon which to press when it is desired to slidesaid plate and disengage said nut from the screw 20. The plate 25 has an opening therein as at 28 through which the shank 11 passes and by which it is guided in its sliding movements.

The said opening is of suiiicient length to permit of the proper amount'of movement of saidyplate to disengage said nut.

The plate 25 is held from movement longitudinally oi the shank 11 inone direction by the top of the handle 10 against which it'bears andby the shoulders formed on the shank '11 in the other direction, between which and the top of said handle 10 said plate is free to move transversely otsaid shank. Asseen in l igure l the wrench is about to be applied to a nut or bolt, the stationary jawl being already in engagement therewith. By the use of one hand the operator may pressthe spring abutment 27 thereby sliding plate 25 against the action of spring 26 whereupon the nut 21 will disengage from the teeth *20 and immediately the spring 19 will force the ex tension 18 and attached jaw 17 1upwar dly till said jawmeets the nut or bolt'as seen in Figure. 2. The pressure may now be released and the nut 21 will resume engagement with the teeth 20,,and if necessary or desired the jaw' 17 may befurther adjusted toward or ,from the said bolt the nut in one direction or the otherf If for any reason the jaws should clamp.

the bolt so tightly, that the wrench could not be readily removed therefrom without disengaging the nut 21, the operator may press the abutment 27to disengage the nut and at the same time force thehandle 10 toward the bolt, which action will separate the jawsjand of coursecompress the spring.

19, and at this time the pressure may be again released and the nut engagedwith the teeth 20 and the wrenchis readyior another operation.

From the foregoingit will be readily seen that the wrench is readily operated by the use of. one hand, this feature being of especial importancein certain classes of Work, such for instance as automobile re- Jpair work Where a wrench of this character may oftentimes be used on bolts or nuts that are so inaccessible that the ordinary wrench requiring the use of two hands to adjust would be useless.

It is not known that a wrench of this class having a movable jaw that is normally held locked relatively. to the stationary jaw but automatically moved toward said jaw upon being unlocked has ever been used, and therefore -it is not the intention to limit this invention to the precise construction herein shown and described; as it is obvious that various changes may be made therein without departing from its spirit and scope.

Having described the" invention I claim:

Ina wrench ot' the class describecha sta tionary jaw having a shank; a handle to which said jawshank is secured; a movable jaw adapted to slide on said'shank having a threaded extension adapted to enter a recess in said handle; an adjustingnut normally in engagementtwith saidithre'aded extension and normally operable to regulate the opening between said jaws; a slidable plate on which Signed by me at Boston, Mass, this 29th day of'March, 1922.

RICHARD MACKIN. 

